What was the rays angle of incidence on the diamond

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Q. A diamond is underwater. A light ray enters one face of the diamond, then travels at an angle of 30 degress with respect to the normal.What was the ray's angle of incidence on the diamond?

Q. A 1.60 x10^2 kg crate is being pushed across a horizontal floor by a force that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.400. What should be the magnitude of , so that the net work done by it and the kinetic frictional force is zero?

Reference no: EM1359458

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